Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP

Oyama, S. and Watkins, B. J. and Djuth, F. T. and Kosch, Mike J. and Bernhardt, P. A. and Heinselman, C. J. (2006) Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP. Journal of Geophysical Research, 111 (A6). A06309. ISSN 0148-0227

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Abstract

Plasma lines excited by a powerful, high-frequency (HF) radio wave are studied using data obtained with an ultrahigh frequency (UHF) radar at HAARP (High Frequency Active Auroral Research Program) from 3 to 5 February 2005. Of particular interest is persistent enhancement of the radar backscatter power during HF on at several HF frequencies. The persistent enhancement is induced with the HF frequency slightly lower than foF2 by a few hundred kHz; by contrast the persistent enhancement does not appear when the HF frequency is equal to and higher than foF2 or lower than foF2 by more than 500 kHz. When persistent enhancements of the radar backscatter power appear, two case studies show that the local plasma frequency at the reflection height of the O-mode polarization wave is close to the second or third electron gyroharmonic frequencies, but one case study shows that the local plasma frequency at the reflection height is significantly different from the third electron gyroharmonic frequency.

Item Type: Journal Article
Journal or Publication Title: Journal of Geophysical Research
Additional Information: Copyright (2006) American Geophysical Union.
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/t1
Subjects:
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
ID Code: 6693
Deposited By: ep_importer_dcs
Deposited On: 21 Apr 2008 11:23
Refereed?: Yes
Published?: Published
Last Modified: 25 Aug 2019 01:02
URI: https://eprints.lancs.ac.uk/id/eprint/6693

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